LAWTON, Okla. (AP) —A medical helicopter with four people on board has crash landed outside a hospital in Comanche County.

Lawton police say the helicopter lost power around 6 a.m. Thursday while landing at Comanche County Memorial Hospital. Hospital officials say the helicopter’s pilot managed to safely land it along a nearby roadway.

The helicopter was operated by Mesa, Arizona-based Survival Flight, which began operating at the Comanche County hospital this week. A Survival Flight spokesman, Vice President Andy Arthurs, says none of the four crew members on board the helicopter was injured.

Arthurs says officials have no indication what caused the crash landing. He says investigators from the Federal Aviation Administration and the National Transportation Safety Board were at the scene Thursday afternoon.